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15 cards from this deck
Can pass through Earth's atmosphere
Must travel long distances without being absorbed
Water molecules
A few centimetres
Water molecules transfer heat to rest of food
All hot objects
Hotter objects give off more IR radiation
Detect suspects in the dark
Detect motion/heat to trigger alarms or lights
Use IR to heat food when absorbed
Infrared radiation and visible light
Short distances only
Must be in line of sight of emitter
Thin strands of glass or plastic
Total internal reflection
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